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Vista taskbar thumbnails

 
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skrommel



Joined: 30 Jul 2004
Posts: 180
PostPosted: Sun Feb 25, 2007 2:06 am    Post subject: Vista taskbar thumbnails Reply with quote
Smile Anyone running Vista?

I thought I'd make a window watcher using Vista's WDM, but my code won't work. Could it be my struct handling? There's a byte and two booleans in there...

The code is stolen from http://msdn2.microsoft.com/en-us/library/aa969541.aspx.

Code:
#SingleInstance,Force
#NoEnv

Gui,Show,w200 h200
Gui,+LastFound
WinGet,target,Id,A


   VarSetCapacity(thumbnail,4,0)

   VarSetCapacity(size,8,0)
   InsertInteger(100,size,0)
   InsertInteger(100,size,4)

   source:=DllCall("FindWindow","Str","Progman","UInt",0)
   hr:=DllCall("dwmapi.dll\DwmRegisterThumbnail","UInt",target,"UInt",source,"UInt",&size,"UInt",&thumbnail)

   VarSetCapacity(rcDestination,16,0)
   InsertInteger(  0,rcDestination,0)
   InsertInteger(  0,rcDestination,4)
   InsertInteger(100,rcDestination,8)
   InsertInteger(100,rcDestination,12)

   VarSetCapacity(rcSource,16,0)
   InsertInteger(  0,rcSource,0)
   InsertInteger(  0,rcSource,4)
   InsertInteger(100,rcSource,8)
   InsertInteger(100,rcSource,12)

;        public struct ThumbnailProperties
;        {
;            public int Flags; 4
;            public Rectangle rcDestination; 16
;            public Rectangle rcSource; 16
;            public Byte Opacity; 1
;            public bool Visible; 1
;            public bool SourceClientAreaOnly; 1
;        }

;     dwFlags = DWM_TNP_RECTDESTINATION | DWM_TNP_VISIBLE | DWM_TNP_SOURCECLIENTAREAONLY
      dwFlags:=0X00000001 | 0x00000008 | 0x00000010
      opacity:=150
      fVisible:=1
      fSourceClientAreaOnly:=1

   VarSetCapacity(dskThumbProps,39,0)
   InsertInteger(dwFlags,dskThumbProps,0)
   InsertInteger(rcDestination,dskThumbProps,4)
   InsertInteger(rcSource,dskThumbProps,20)
  InsertInteger(opacity,dskThumbProps,36,1)
  InsertInteger(fVisible,dskThumbProps,37,1)
  InsertInteger(fSourceClientAreaOnly,dskThumbProps,38,1)

;   //display the thumbnail
   hr:=DllCall("dwmapi.dll\DwmUpdateThumbnailProperties","UInt",thumbnail,"UInt",&dskThumbProps)
MsgBox,%hr%
Return


ExtractInteger(ByRef pSource, pOffset = 0, pIsSigned = false, pSize = 4)
{
    Loop %pSize%  ; Build the integer by adding up its bytes.
        result += *(&pSource + pOffset + A_Index-1) << 8*(A_Index-1)
    if (!pIsSigned OR pSize > 4 OR result < 0x80000000)
        return result  ; Signed vs. unsigned doesn't matter in these cases.
    ; Otherwise, convert the value (now known to be 32-bit) to its signed counterpart:
    return -(0xFFFFFFFF - result + 1)
}

InsertInteger(pInteger, ByRef pDest, pOffset = 0, pSize = 4)
{
    Loop %pSize%  ; Copy each byte in the integer into the structure as raw binary data.
        DllCall("RtlFillMemory", "UInt", &pDest + pOffset + A_Index-1, "UInt", 1, "UChar", pInteger >> 8*(A_Index-1) & 0xFF)
}
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Sean



Joined: 12 Feb 2007
Posts: 1359
PostPosted: Sun Feb 25, 2007 4:31 am    Post subject: Reply with quote
Looks interesting. It's unfortunate that I don't have Vista yet.
Anyway, all seem fine except one thing. May add this 1-line after DwmRegisterThumbnail call:

Code:
thumbnail := ExtractInteger(thumbnail)


BTW, you said BOOLEAN, not BOOL. Although I think BOOLEAN seems a bit more natural here, should make it clear:
BOOLEAN: 1 byte
BOOL: 4 byte
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skrommel



Joined: 30 Jul 2004
Posts: 180
PostPosted: Sun Feb 25, 2007 9:25 am    Post subject: Really? Reply with quote
Sad I think you're right about
Quote:
thumbnail := ExtractInteger(thumbnail)
but it still won't work.

Quote:
you said BOOLEAN

Sorry.

Skrommel
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Sean



Joined: 12 Feb 2007
Posts: 1359
PostPosted: Sun Feb 25, 2007 11:51 am    Post subject: Reply with quote
The documentations are confusing. The size parameter is absent here:
http://msdn2.microsoft.com/en-us/library/aa969521.aspx

So, first have to check which one gives a meaningful result.
And, the type is really BOOL in the last struct, so the size should be changed from 39 to 45. This struct looks a bit awkward to me, but documentation is documentation.
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skrommel



Joined: 30 Jul 2004
Posts: 180
PostPosted: Mon Aug 04, 2008 12:50 am    Post subject: Reply with quote
Smile I finally found the solution!

I've posted it here: http://www.autohotkey.com/forum/viewtopic.php?p=211707
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